GMYLE (TM PCI-Express USB 3.0 2 Ports With 4-Pin Molex Power NEC D720202 Chipset Control Card Adapter Compliant with USB 3.0 specification Revision 1.0 Low profile bracket up to 5Gbps transferring speed Supports Windows Xp/Server 2003/Vista.Server 2008/Windows 7 Built in 4-pin molex power for better support on power hungry bus-powered devices USB 3.0 is backwards compatible with USB 1.0/1.1/2.0 devices